This problem has been plagueing me for quite a long time and I have no idea what to try next. A friend of mine just had the same thing happen to him, so I'm going to offer 200 points for this one to figure it out quickly.
I am using Windows XP Pro. This happens to still be a factory install on a Dell Optiplex GX240 at home. I have a cable Internet connection that connects directly to a Linksys 4-port router and then the 4 ports connect to 5 port Linksys switches in different rooms. The switches, in turn, get connected to the various computers in each room to supply Internet and LAN connectivity.
I happen to have 2 of the Optlpex GX240s. Each resides in a different room. I believe that when I purchased these computers, I didn't have this problem, but shortly thereafter, I somehow gained an "Internet Gateway" connection. The connection is called "Internet Connection". I can see that if I were to download a huge file from the Internet to Computer1, if I were to go look at Computer2's traffic, all the traffic from Computer1's download would be sent through Computer2's Internet gateway connection and vice versa...
If I was to disable the connection on one of the computers, the other would no longer be able to access the Internet on the other.
If I was to remove the connection, it would reappear within 1-2 reboots.
Does anyone have any information on this?
Is there any way I can permanently remove the Internet Gateways from both computers?